245 
Ireland, even to the broad sulcus in the front part of the ventral valve. A few of the 
specimens are rounder and deeper, and approach the figure given by the same Author of 
examples from Torkshire.f A few external impressions have also been obtained, in 
some of which I believe it is possible to trace the characteristic spines. The largest 
specimens, however, both external impressions and internal easts, have been collected by 
the late Mr. James Smith, at Stan well. 
Prof. L. G-. De Koninct united Ortliis australis, McCoy, with this species, and in 
this I followed him in the “ Catalogue of Australian Fossils.” But on looking into the 
matter again it seems to me that a good deal may be said for the separate retention of 
the latter as a species. By its general outline and form, 0. australis appears to be a 
much nearer ally of Orthis Michelini. 
Loc. and Horizon. Corner Creek, Great Star Eiver (i2. L. Jack and P. W. 
Pears') — Star Beds ; Stony Creek, Stanwell, near Eockhampton {The late James Smith) ; 
Gracemere Eidges, Stanwell, near Eockhampton {A. F. Wood) ? ; Athelstane Eange^ 
Eockhampton {The late James Smith) ; Hawkins’ Gully, Kariboe Creek, Kroombit 
Diggings, Port Curtis {W. H. Bands) — Gympie Beds. 
Oetuis australis, McCoy, PI. 11, figs. 27 and 29. 
Orthis australis, McCoy, Arm. and Ma". Nat. Hist., 1847, xx., p. 234, t. 13, f. 4 and 4a. 
Ohs. Internal casts and external impressions have been collected in the 
Dockhampton District both by Mr. C. W. De Vis and the late Mr. James Smith. Some of 
these closely resembled Orthis Michelini, Leveille,J but differed from this well-known 
European species in possessing porportionately longer, narrower, and more reniform 
cardinal muscular impressions. In addition to this, the adductor impressions were also 
■Auch smaller. I think there can be little doubt, however, that O, australis, McCoy, is 
the representative of the other species in Australian rocks. The adductor impressions 
are simple, as in Orthis resupinata, but more heart-shaped, and not double as in 
Michelini, but beyond this the only other points of difference are those stated above. 
Ihe pedicle sear is strong and well marked (PI. 11, fig. 29), but the ovarian impressions 
not apparent; and, lastly, the dental plates are certainly longer for the size of the 
®hell than in 0. Michelini. 
Loc. and Horizon. Stony Creek, Stanwell {The late James Smith) — Eockhampton 
District ; § (0. W. Be Vis ; Colin. De Vis) — Gympie Beds. 
Family— STE0PII0MENID2E. 
Qenus — STBOPHOMFNA {Bajinesque, 1820), Blainville, 1824. 
(Diet. Sci. Nat., xxxii., p. 302.) 
SxROPiiOMEHA EiiOMBOiDALis, var. ANALOUA, Phillips. 
PI. 12, figs. 8 and 9 ; PI. 40, fig. 6. 
^roducta avaloga, Phillips, 111. Geol. Yorhsh., 183G, Pt. 2, p. 215, t. 7, f. 10. 
^ephomena rhomboidalis, var. analoga, Davidsen, Mon. Brit Carb. Brach., 18G0, Pt. 3, p. 119, t. 28, f. 1-13 
{for general synonymy). 
,1 ,, ,, Etheridge, Quart. Journ. Geol. Soc., 1872, xxviii., pp. 331 and 333 
1. 15, f. 3 and 5 % t. 16, f. 7, t. 18, f. 1. 
), ,, ,, Etheridge fil.. Cat. Australian Eossils, 1878, p. 60. 
Ohs. This shell occurs in the Silurian, Devonian, and Carboniferous rocks over 
areas of the globe, and abundantly in the Permo-Carboniferous Series of the 
* Mon. Brit. Carb. Brach., 1861, Pt. iv., t. 30, f. 1. 
t Ibid., t. 30, f. 3. 
J Mem. Soc. Geol. France, 1835, ii., p. 39. 
§ See note, p. 199. 
